Minergate gives a bit more information about their so-called "unconfirmed" balance at https://minergate.com/faq/what-is-unconfirmed-balance - but not really anything useful. However, they're not a very popular pool and I suspect partially due to their lack of transparency on issues like this (as others have noticed) I tend to prefer other pools like dwarfpool or nanopool, albeit they're a bit harder to get set up.